Default dimensions for new data set attributes

For a new data set, whether each attribute can be used as a dimension is based on the data type and number of values.

If an attribute is a dimension, then the attribute values can be used to aggregate metric values.

For each data type, Studio uses the following rules to determine whether an attribute is a dimension:

Data Type	Dimension?
String	Yes, if the attribute values have fewer than 75 characters, or if the attribute is multi-value.
Numeric	Yes, if the attribute has a low number of unique values.
Date/Time	Yes
Boolean	Yes
Geocode	No

The string lengths and number of unique values are determined based on a sampling of the first 1000 records.